Decorate a filter with scheduling information. More...

#include <EC_Sched_Filter.h>

Inheritance diagram for TAO_EC_Sched_Filter:

Collaboration diagram for TAO_EC_Sched_Filter:

Public Member Functions
	TAO_EC_Sched_Filter (const char name, RtecScheduler::handle_t rt_info, RtecScheduler::Scheduler_ptr scheduler, TAO_EC_Filter body, RtecScheduler::handle_t body_info, RtecScheduler::handle_t parent_info, RtecScheduler::Info_Type_t info_type)
virtual	~TAO_EC_Sched_Filter (void)
	Destructor.
virtual ChildrenIterator	begin (void) const
virtual ChildrenIterator	end (void) const
virtual int	size (void) const
virtual int	filter (const RtecEventComm::EventSet &event, TAO_EC_QOS_Info &qos_info)
virtual int	filter_nocopy (RtecEventComm::EventSet &event, TAO_EC_QOS_Info &qos_info)
virtual void	push (const RtecEventComm::EventSet &event, TAO_EC_QOS_Info &qos_info)
virtual void	push_nocopy (RtecEventComm::EventSet &event, TAO_EC_QOS_Info &qos_info)
virtual void	clear (void)
virtual CORBA::ULong	max_event_size (void) const
	Returns the maximum size of the events pushed by this filter.
virtual int	can_match (const RtecEventComm::EventHeader &header) const
virtual int	add_dependencies (const RtecEventComm::EventHeader &header, const TAO_EC_QOS_Info &qos_info)
virtual void	get_qos_info (TAO_EC_QOS_Info &qos_info)
Private Member Functions
	TAO_EC_Sched_Filter (const TAO_EC_Sched_Filter &)
TAO_EC_Sched_Filter &	operator= (const TAO_EC_Sched_Filter &)
void	init_rt_info (void)
	Initialize our RT_Info handle and dependencies.
void	compute_qos_info (TAO_EC_QOS_Info &qos_info)
	Compute a new qos_info to push up.
Private Attributes
RtecScheduler::handle_t	rt_info_
	The RT_Info handle for this object.
int	rt_info_computed_
	Has the Scheduler been updated?
ACE_CString	name_
	Our operation name.
RtecScheduler::Scheduler_var	scheduler_
	The scheduler we are going to use.
TAO_EC_Filter *	body_
	The implementation.
RtecScheduler::handle_t	body_info_
	The RT_Info handle for the body.
RtecScheduler::handle_t	parent_info_
	The RT_Info handle for the parent.
RtecScheduler::Info_Type_t	info_type_
	Required for the scheduling service.

Detailed Description

Decorate a filter with scheduling information.

This filter decorates a regular filter with scheduling information. It creates a new RT_Info entry for the filter and it adds the dependencies between the filter and any childrens it may have.

Memory Management

It assumes ownership of the children.

Constructor & Destructor Documentation

TAO_EC_Sched_Filter::TAO_EC_Sched_Filter	(	const char *	name,
		RtecScheduler::handle_t	rt_info,
		RtecScheduler::Scheduler_ptr	scheduler,
		TAO_EC_Filter *	body,
		RtecScheduler::handle_t	body_info,
		RtecScheduler::handle_t	parent_info,
		RtecScheduler::Info_Type_t	info_type
	)

Constructor. It assumes ownership of the <body>, makes a copy of the other parameters

TAO_EC_Sched_Filter::~TAO_EC_Sched_Filter ( void ) [virtual]

Destructor.

TAO_EC_Sched_Filter::TAO_EC_Sched_Filter ( const TAO_EC_Sched_Filter & ) [private]

Member Function Documentation

int TAO_EC_Sched_Filter::add_dependencies	(	const RtecEventComm::EventHeader &	header,
		const TAO_EC_QOS_Info &	qos_info
	)		`[virtual]`

This is used for computing the scheduling dependencies:

Leaf filters check if the header could be matched, similar to the can_match() method; if it does they return 1, and 0 otherwise. Intermediate nodes always return 0.

This is used to build precise dependencies between the suppliers and the leaf of the filters that accept that event. Notice that only the nodes doing scheduling recurse through the list, so in configurations that do no require scheduling the recursion stops fairly soon.

Implements TAO_EC_Filter.

TAO_EC_Filter::ChildrenIterator TAO_EC_Sched_Filter::begin ( void ) const [virtual]

STL-like iterators Filters follow the Composite pattern. All filters expose the same interface as if they all had children, but for simple filters the iterators return an empty range.

Reimplemented from TAO_EC_Filter.

int TAO_EC_Sched_Filter::can_match ( const RtecEventComm::EventHeader & header ) const [virtual]

Returns 0 if an event with that header could never be accepted. This can used by the suppliers to filter out consumers that couldn't possibly be interested in their events. The rt_info and

Implements TAO_EC_Filter.

void TAO_EC_Sched_Filter::clear ( void ) [virtual]

Clear any saved state, must reset and assume no events have been received.

Implements TAO_EC_Filter.

void TAO_EC_Sched_Filter::compute_qos_info ( TAO_EC_QOS_Info & qos_info ) [private]

Compute a new qos_info to push up.

TAO_EC_Filter::ChildrenIterator TAO_EC_Sched_Filter::end ( void ) const [virtual]

Reimplemented from TAO_EC_Filter.

int TAO_EC_Sched_Filter::filter	(	const RtecEventComm::EventSet &	event,
		TAO_EC_QOS_Info &	qos_info
	)		`[virtual]`

Filter this event, returns 1 if the event is accepted, 0 otherwise. Notice that there are two versions of the method, if the event is not const then filter can take ownership of the event.

Attention:: There seems to be a disparity in interfaces: Supplier always push event sets of size 1 to the EC_ProxyPushSupplier, and EC_Filters do not implement handling of sets of more than 1 event. Then, why is this not enforced by the interface by having EC_ProxyPushSupplier take an event rather than a set?

Implements TAO_EC_Filter.

int TAO_EC_Sched_Filter::filter_nocopy	(	RtecEventComm::EventSet &	event,
		TAO_EC_QOS_Info &	qos_info
	)		`[virtual]`

Implements TAO_EC_Filter.

void TAO_EC_Sched_Filter::get_qos_info ( TAO_EC_QOS_Info & qos_info ) [virtual]

Obtain the QOS information for this filter, the default implementation returns an invalid QOS. Only the filters that support scheduling information implement this method.

Returns:: Returns 0 on success and -1 on failure

Reimplemented from TAO_EC_Filter.

void TAO_EC_Sched_Filter::init_rt_info ( void ) [private]

Initialize our RT_Info handle and dependencies.

CORBA::ULong TAO_EC_Sched_Filter::max_event_size ( void ) const [virtual]

Returns the maximum size of the events pushed by this filter.

Implements TAO_EC_Filter.

TAO_EC_Sched_Filter& TAO_EC_Sched_Filter::operator= ( const TAO_EC_Sched_Filter & ) [private]

void TAO_EC_Sched_Filter::push	(	const RtecEventComm::EventSet &	event,
		TAO_EC_QOS_Info &	qos_info
	)		`[virtual]`

This is called by the children when they accept an event and which to pass it up. Notice that there are two versions of the method, if the event is not const then filter can take ownership of the event.

Implements TAO_EC_Filter.